Remove stray root dependencies block

The root package.json carried expo/react/react-native pins since
310f20e (added incidentally while debugging the Android dev server).
apps/mobile pins its own expo, and react/react-dom are governed by
the workspace catalog + overrides, so the block only forced a
parallel Expo 55 / react-native 0.83 tree into the lockfile
(-1569 lines) and pinned react at 19.2.0 next to the catalog's
19.2.7 — the likely cause of the react/react-dom version-mismatch
failures on the @testing-library/react-native bump (#480).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -85,10 +85,5 @@
     "vite": "catalog:",
     "vitest": "^4.1.8"
   },
-  "version": "1.0.0",
-  "dependencies": {
-    "expo": "~55.0.24",
-    "react": "19.2.7",
-    "react-native": "0.83.4"
-  }
+  "version": "1.0.0"
 }